1 a Department of Optometry, Faculty of Health Sciences , Universiti Teknologi MARA , Selangor DE , Malaysia .
2 b Optometry & Vision Science Program, Faculty of Health Sciences, School of Healthcare Sciences, Universiti Kebangsaan Malaysia , Kuala Lumpur , Malaysia , and.
3 c Chung Optometry Consultant , Setapak , Kuala Lumpur , Malaysia.